1、opencv版本选择1.0。编译环境为vc6.0绿色版。
2、下载OpenCV安装程序（1.0版本）。假如要将opencv安装到C:\Program Files\OpenCV。在安装时选择”将?? \OpenCV\bin加入系统变量”。或安装完成后手动添加环境变量“C:\Program Files\OpenCV\bin”。安装完成后重启才能使得环境变量生效。
3、VC6.0配置
启动VC++6.0，菜单Tools->Options->Directories：先设置lib路径，选择Library files，在下方填入路径：????????? C:\Program Files\OpenCV\lib
然后选择include files，在下方填入路径：
C:\Program Files\OpenCV\cxcore\include
C:\Program Files\OpenCV\cv\include
C:\Program Files\OpenCV\cvaux\include
C:\Program Files\OpenCV\ml\include
C:\Program Files\OpenCV\otherlibs\highgui
C:\Program Files\OpenCV\otherlibs\cvcam\include
4.每创建一个将要使用OpenCV的VC Project，都需要给它指定需要的lib。菜单：Project->Settings，然后将Setting for选为All Configurations，然后选择右边的link标签，在Object/library modules附加上：
cxcore.lib cv.lib ml.lib cvaux.lib highgui.lib cvcam.lib
如果不需要这么多lib，你可以只添加你需要的lib。
// PictureSelectToSave.cpp : Defines the entry point for the console application.
//
//#include "stdafx.h"
//#include <iostream.h>
#include <cv.h>
#include <highgui.h>
#include <math.h>
#include <stdio.h>
#include <cxcore.h>
IplImage* img=0;
CvRect selection;
CvPoint origin;
int select_object = 0;
int track_object = 0;
//////鼠标事件函数
void on_mouse( int event, int x, int y, int flags, void* param )
{
if( !img )
return;
if( img->origin )
y = img->height - y;
if( select_object )
{
selection.x = MIN(x,origin.x);
selection.y = MIN(y,origin.y);
selection.width = selection.x + CV_IABS(x - origin.x);
selection.height = selection.y + CV_IABS(y - origin.y);
selection.x = MAX( selection.x, 0 );
selection.y = MAX( selection.y, 0 );
selection.width = MIN( selection.width, img->width );
selection.height = MIN( selection.height, img->height );
selection.width -= selection.x;
selection.height -= selection.y;
}
switch( event )
{
case CV_EVENT_LBUTTONDOWN:
origin = cvPoint(x,y);
selection = cvRect(x,y,0,0);
select_object = 1;
break;
case CV_EVENT_LBUTTONUP:
select_object = 0;
if( selection.width > 0 && selection.height > 0 )
track_object = -1;
break;
}
if( track_object <0 )
{
CvPoint point1 = { selection.x,selection.y};
CvPoint point2 = { selection.x+selection.width+1, selection.y+selection.height+1 };
//////画面上画框并显示
if(selection.width>0 && selection.height>0)
cvRectangle(img,point1,point2,CV_RGB(0,255,0),1,8,0);
cvShowImage( "PictureShow", img);
/////获得框中图片区域
///方法一：可获得与原图像大小一样的图片///
/*
IplImage* img2 = cvCreateImage(cvGetSize(img), 8, 1 );
cvSet(img2,CV_RGB(0,0,0),NULL);//背景设为白色
cvRectangle(img2,point1,point2, CV_RGB(255,255,255),-1,8,0);//框区域设为黑色
cvAnd(img,img2,img2);//逻辑与运算
cvShowImage("output", img2);
cvSaveImage(".\\output\\SelectedAera.jpg",img2);
*/
///方法二：仅仅将获取图片保存为实际区域的大小///
IplImage* img2 = cvCreateImage(cvSize(selection.width+1,selection.height+1), 8,1 );
CvRect rect = cvRect(selection.x, selection.y, selection.width+1,selection.height+1);
cvSetImageROI(img, rect);
cvCopy(img,img2);//复制对象区域
cvShowImage("output", img2);
cvResetImageROI(img);
cvSaveImage(".\\a2.bmp",img2);
}
}
int main()
{
img=cvLoadImage("C:\\a1.bmp",0 );
//cvCanny(img,img, 120, 120, 3);
cvNamedWindow( "PictureShow", CV_WINDOW_AUTOSIZE );
cvNamedWindow( "output",1 );
//////鼠标事件回调函数
cvSetMouseCallback( "PictureShow",on_mouse,0);
cvShowImage( "PictureShow", img);
cvWaitKey(0);
cvDestroyWindow( "PictureShow" );//销毁窗口
cvDestroyWindow( "output" );
cvReleaseImage( &img ); //释放图像
// cvReleaseImage( &img2 );
return 0;
}